package br.com.goldentrade.util.table;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.Enumeration;
import java.util.Hashtable;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class GroupableTableHeaderUI extends BasicTableHeaderUI {

	public void paint(Graphics g, JComponent c) {
		Rectangle clipBounds = g.getClipBounds();
		if (header.getColumnModel() == null) return;
		((GroupableTableHeader)header).setColumnMargin();
		int column = 0;
		Dimension size = header.getSize();
		Rectangle cellRect  = new Rectangle(0, 0, size.width, size.height);
		Hashtable h = new Hashtable();
		int columnMargin = 0; //header.getColumnModel().getColumnMargin();

		Enumeration enumeration = header.getColumnModel().getColumns();
		while (enumeration.hasMoreElements()) {
			cellRect.height = size.height;
			cellRect.y      = 0;
			TableColumn aColumn = (TableColumn)enumeration.nextElement();
			Enumeration cGroups = ((GroupableTableHeader)header).getColumnGroups(aColumn);
			if (cGroups != null) {
				int groupHeight = 0;
				while (cGroups.hasMoreElements()) {
					ColumnGroup cGroup = (ColumnGroup)cGroups.nextElement();
					Rectangle groupRect = (Rectangle)h.get(cGroup);
					if (groupRect == null) {
						groupRect = new Rectangle(cellRect);
						Dimension d = cGroup.getSize(header.getTable());
						groupRect.width  = d.width;
						groupRect.height = d.height;    
						h.put(cGroup, groupRect);
					}
					paintCell(g, groupRect, cGroup);
					groupHeight += groupRect.height;
					cellRect.height = size.height - groupHeight;
					cellRect.y      = groupHeight;
				}
			}      
			cellRect.width = aColumn.getWidth() + columnMargin;
			if (cellRect.intersects(clipBounds)) {
				paintCell(g, cellRect, column);
			}
			cellRect.x += cellRect.width;
			column++;
		}
	}

	private void paintCell(Graphics g, Rectangle cellRect, int columnIndex) {
		TableColumn aColumn = header.getColumnModel().getColumn(columnIndex);
		TableCellRenderer renderer = aColumn.getHeaderRenderer();
		//revised by Java2s.com
		renderer = new DefaultTableCellRenderer(){
			public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
				JLabel header = new JLabel();
				header.setForeground(table.getTableHeader().getForeground());
				header.setBackground(table.getTableHeader().getBackground());
				header.setFont(table.getTableHeader().getFont());

				header.setHorizontalAlignment(JLabel.CENTER);
				header.setText(value.toString());
				header.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
				return header;
			}

		};
		Component c = renderer.getTableCellRendererComponent(
				header.getTable(), aColumn.getHeaderValue(),false, false, -1, columnIndex);

		c.setBackground(UIManager.getColor("control"));

		rendererPane.add(c);
		rendererPane.paintComponent(g, c, header, cellRect.x, cellRect.y,
				cellRect.width, cellRect.height, true);
	}

	private void paintCell(Graphics g, Rectangle cellRect,ColumnGroup cGroup) {
		TableCellRenderer renderer = cGroup.getHeaderRenderer();
		//revised by Java2s.com
		// if(renderer == null){
		//      return ;
		//    }

		Component component = renderer.getTableCellRendererComponent(
				header.getTable(), cGroup.getHeaderValue(),false, false, -1, -1);
		rendererPane.add(component);
		rendererPane.paintComponent(g, component, header, cellRect.x, cellRect.y,
				cellRect.width, cellRect.height, true);
	}

	private int getHeaderHeight() {
		int height = 0;
		TableColumnModel columnModel = header.getColumnModel();
		for(int column = 0; column < columnModel.getColumnCount(); column++) {
			TableColumn aColumn = columnModel.getColumn(column);
			TableCellRenderer renderer = aColumn.getHeaderRenderer();
			//revised by Java2s.com
			if(renderer == null){
				return 60;
			}

			Component comp = renderer.getTableCellRendererComponent(
					header.getTable(), aColumn.getHeaderValue(), false, false,-1, column);
			int cHeight = comp.getPreferredSize().height;
			Enumeration e = ((GroupableTableHeader)header).getColumnGroups(aColumn);      
			if (e != null) {
				while (e.hasMoreElements()) {
					ColumnGroup cGroup = (ColumnGroup)e.nextElement();
					cHeight += cGroup.getSize(header.getTable()).height;
				}
			}
			height = Math.max(height, cHeight);
		}
		return height;
	}

	private Dimension createHeaderSize(long width) {
		TableColumnModel columnModel = header.getColumnModel();
		width += columnModel.getColumnMargin() * columnModel.getColumnCount();
		if (width > Integer.MAX_VALUE) {
			width = Integer.MAX_VALUE;
		}
		return new Dimension((int)width, getHeaderHeight());
	}

	public Dimension getPreferredSize(JComponent c) {
		long width = 0;
		Enumeration enumeration = header.getColumnModel().getColumns();
		while (enumeration.hasMoreElements()) {
			TableColumn aColumn = (TableColumn)enumeration.nextElement();
			width = width + aColumn.getPreferredWidth();
		}
		return createHeaderSize(width);
	}
}



